we will not run out of usable water because waste water can be purified through a special process

分类: 作业答案 • 2022-01-09 18:02:09

问题描述：

we will not run out of usable water because waste water can be purified through a special process
改成虚拟语句

答

If waste water could not be purified through a special process,we would run out of usable water.